Overview
The cybersecurity landscape never stays the same for long, with new vulnerabilities being identified regularly. One such recent discovery is the CVE-2025-9812, a critical buffer overflow vulnerability affecting Tenda CH22 1.0.0.1. This vulnerability, due to its potential for system compromise and data leakage, poses a significant threat to any system or organization using this version of Tenda CH22. The importance of understanding and addressing this vulnerability cannot be overstated.
Vulnerability Summary
CVE ID: CVE-2025-9812
Severity: Critical (8.8/10 on the CVSS scale)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Tenda CH22 | 1.0.0.1
How the Exploit Works
The vulnerability exists within the `formexeCommand` function of the `/goform/exeCommand` file in the Tenda CH22 1.0.0.1. By manipulating the `cmdinput` argument, an attacker can cause a buffer overflow. This overflow can lead to unpredictable behavior, including potential system compromise and data leakage. This exploit has been publicly disclosed and can be performed remotely, increasing the ease and potential scope of attacks.
Conceptual Example Code
Here’s a conceptual example of how this vulnerability might be exploited via a malicious HTTP POST request:
POST /goform/exeCommand HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "cmdinput": "[malicious payload causing buffer overflow]" }In the above example, the malicious payload is sent via the ‘cmdinput’ field in the HTTP POST request, causing a buffer overflow within the `formexeCommand` function, leading to potential system compromise or data leakage.
Mitigation Guidance
To mitigate this vulnerability, the most effective solution is to apply the vendor-provided patch, if available. If for any reason, the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These systems can be configured to detect and block exploitation attempts, protecting the system until the patch can be applied. However, these measures are not foolproof and cannot substitute the need for patching.
